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I had a problem last weekend with the battery system. Following a four hour drive and overnight parking, I returned to the Niro on Saturday to find it completely unresponsive. Lights are always on auto. Used the mechanical key to open the door and got no response when trying to start the engine. Using the battery reset button did not help. Got roadside assistance after a wait and the guy jump started the engine using Kia's prescribed method. Niro has driven and behaved fine since. Took it into dealer today (Tuesday) to see what the problem is and was surprised to learn that the car has no error codes or other indication that there was ever a problem. Service guys say everything checks out fine. Kia Customer Service says you only get error codes if the Check Engine light comes on which apparently doesn't happen if both batteries are dead.

Any idea what would cause this kind of behavior?
 

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Something that was using electricity in your absence. You knew that of course. There were a couple of known issues with the 2017 like a door handle/lock and a junction box, but I've not heard about much since. Could be very random never to happen again. More disturbing is your battery reset didn't work. I'd ask your dealer to leave the dome light on overnight and test that function. I'm sure they have already checked that static electrical drain is within spec.
 

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Might just not be a battery drain at all. Could be the sensor that checks battery level is bad.

From what I understand, draining a hybrid vehicles battery is a huge problem, the gauge on the dash that goes from 0 to 100% is actually closer to 50 - 80% because thats where the batteries like to live, less than that causes damage and more than that wouldn't allow the regenerative brakes to function.

My guess is a sensor, not the battery pack, but if it is the batteries, get ready for failure.
 

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I have read that leaving ANYTHING plugged in any of the usb ports or the 12V ports can drain the battery...........just a thought
 

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Don't think it would take much to fully drain the battery overnight. Even a single interior light could do that over a matter of hours. At least it doesn't seem like you need to spend any money on repairs, just try and keep a closer eye on what's being used when driving.
 

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The USB port powers off when you exit the car. However, the OBD2 port does not and I've experienced a misbehaving device that drained my battery. Fortunately the restore button worked.
 

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Go to your dealer. Any device left in USB port or power outlet could not discharge battery because all are disconnected when you turn off ignition.

However there was some repair action to replace BSI/GEM unit, which was described similar. Could cause battery drain. If I find some identifier will post it here. My dealer replaced this unit in mine car.
 

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Discussion Starter #10
Thanks for all the suggestions. The only thing plugged in was a dashcam powered by the cigarette lighter port. The camera also has an auto-off feature. Car was definitely not left on when parked.

Dealer's only suggestion was to have it brought in via tow truck if the problem reoccurred and not to have it jumped off. I will mention your suggestions for possible failure points when I am next in for service.
 

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Inserting the key into the driver's door keyhole and turning it (yeah, for you kids out there - that's actually how locks were opened "back in the day") will ALWAYS open the door, using the "backup key" is not reliant on the battery at all.

If inserting the key & turning it does not open your door, your dealership probably screwed up and gave you the wrong key.

Once you get the door opened, use the battery button right next to your fuel door button, then try to start normally.
 

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What does that battery reset button actually do? Does the Niro have a separate little 12v. battery? I heard someplace that the 12v. battery is part of the hybrid battery. Is that true? I also heard that since they are combined that you can't replace the 12v. battery separately without replace the whole hybrid battery. Is that true?
 

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The 12V battery is electrically separated from the main traction battery, which on the hybrid is 240V. They can't be connected directly!

It is also physically separate from the traction battery, although you can Google a diagram showing it as a small box on the outside of the traction battery. I'm sure it can be replaced without the traction battery, but would be under warranty either way. The battery reset button recharges the 12V battery from the 240V battery. Small enough that it is instant. I've had to do it twice, once for a malfunctioning accessory and once after not driving for several weeks.
 

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The 12V battery is electrically separated from the main traction battery, which on the hybrid is 240V. They can't be connected directly!

It is also physically separate from the traction battery, although you can Google a diagram showing it as a small box on the outside of the traction battery. I'm sure it can be replaced without the traction battery, but would be under warranty either way. The battery reset button recharges the 12V battery from the 240V battery. Small enough that it is instant. I've had to do it twice, once for a malfunctioning accessory and once after not driving for several weeks.
Hey thanks a lot for the info. I guess I got bad info before. I thought it was very odd that the 12v. battery would not be separate from the hybrid battery. That button sounds like a handy feature. I guess the hybrid battery just gives the 12v. battery a quick charge so you can get started?
 

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Wait are you saying if your 12v battery dies, unlike any other vehicle, you don't need a cable jump start because that feature is built in to grab energy from the hybrid battery? That's super cool if so! Is this unique to the Niro? I watched almost every Niro review video on youtube and NOT ONE mentioned this.

Also where is the 12v battery? Some video reviews say it has one some that it doesnt.

And I'm interested specifically in the PHEV details, not sure if that makes a difference from the regular hybrid as far as my questions above.

Thanks!
 

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My PHEV has a 12 volt lead acid battery in the right rear of the cargo area. If left parked for a long time the green charge light on the dash will flash a few times indicating that the traction battery automatically put charge into the 12 volt battery.
 

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Wait are you saying if your 12v battery dies, unlike any other vehicle, you don't need a cable jump start because that feature is built in to grab energy from the hybrid battery? That's super cool if so! Is this unique to the Niro? I watched almost every Niro review video on youtube and NOT ONE mentioned this.

Also where is the 12v battery? Some video reviews say it has one some that it doesnt.

And I'm interested specifically in the PHEV details, not sure if that makes a difference from the regular hybrid as far as my questions above.

Thanks!
For reasons I don't understand, the PHEV and the EV have a regular lead acid battery (although smaller than cars that depend on it for starting the car). Only the HEV has a lithium 12 V battery. The 2017 non North American HEVs also had a lead acid battery. The lithium 12V battery was touted as saving a ton of weight, so I don't get why they don't use it on the PHEV and BEV.

I've seen lots of HEV videos and article pictures showing the exact location of the 12V battery. It is located on the side of the traction battery. The original roadshow for reviewers included no sheet metal car to look at the electrical components. A lithium 12V wouldn't be shown on PHEV reviews of course. Not crazy about having a lead acid battery in the passenger compartment, they do explode sometimes.
 
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